John s



(-Nomodel') J. s. BARTLETT.

DIRECT ACTING ENGINE- No. 404,248. Patented May 28, 1889.

ARQ

a k k I i JUL IIIIIIIIIIIIIIIIIIlIlllllllllIlllllllllllllllllllllllllll l/vii'mcoo (20 amvenwoz, mfg fo/in $.Bartlet6. I 33 mo UNITED STATES PATENT OFFICE.

JOHN S. BARTLETT, OF AKRON, OHIO, ASSIGNOR OF ONE-HALF TO STEPHEN H. PITKIN, OF SAME PLACE.

DIRECT-ACTING ENGINE.

SPECIFICATION forming part of Letters Patent No. 404,248, dated May 28, 1889.

Application filed November 14, 1888. Serial No. 290,764, (No model.)

To all whom it may concern.-

Be it known that 1, JOHN S. BARTLETT, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Direct-Acting Engine, of which the following is a specification.

The object of my invention is the production of direct-acting reciprocating engines of small size for light work, to be operated by air, steam, or water pressure, and in which the number of parts shall be reduced to a minimum.

My invention consists in the construction and arrangement of parts hereinafter fully described and then specifically pointed out in the claims, due reference being had to the accompanying drawings, forming part of this specification.

I11 the accompanying drawings, in which similar letters of reference indicate like parts, Figure 1 is a perspective of the piston of my improved engine, the front end being nearest; Fig. 2, a vertical section of the cylinder at the line w :1: of Fig. 3, looking toward the front end with the connected parts in elevation; and Fig. 3, a vertical longitudinal central section of the cylinder with its connected parts and the piston.

The cylinder A consists of a single casting, closed at one end and open at the other and having a flange by which the head B, provided with the stuffing-box b, is attached. At the center of the cylinder is a foot, 0, by which it is attached to any suitable bed, a projecting tube, D, at the top, and on opposite sides, below the center, an inlet-pipe, E, and an outletpipe, F, said tubes and pipes opening into the cylinder. WVithin the, cylinder is apiston, G, approximately one-half the length of the interior of the cylinder and provided with a piston-rod, g. In the piston are two inlet-ports, e e, and two outlet-ports, f f each of which consists of a deep longitudinal groove in the face of the piston, extending nearly to the ends thereof and approximately equal to the length of its stroke, and each connected at one end by a round orifice through the end of the piston with the interior of the cylinder. The inlet-ports connect with opposite ends of the cylinder, and the outlet-ports are similarly connected, so that the ports 6 f connect with the back of the cylinder and the ports e j with the front thereof. The width of the inlet and outlet ports corresponds, respectively, with the diameter of the inlet E and outlet F, and are so arranged that when an inlet-port which opens in one direction registers with the inlet E the outlet-port which opens in the opposite direction will register with the outlet F. Hence, when the port 6 registers with the inlet E, the port f will register with the outlet F, and as the pressure enters behind the piston to drive it forward the pressure is relieved infront until at the end of the stroke a partial revolution of the piston causes the other ports to register for the return-stroke. To produce this partial revolution there is in the top of the piston a channel, H, extending nearly to the center, of the same length as the port-grooves, the sides of which converge alike relatively to the center and at such an angle as, if projected, to meet below the center. On opposite sides of this channel are ledges I I, with concave faces, which, commencing at opposite ends of the bottom, rise toward the other ends until near the top of the channel, where each terminates abruptly, whence inclined planest' t" lead to the bottom of the other.

In the tube D is fitted a sliding rod, J, with a broad flat top and a rounded lower end, which rests on the concave face of one of the ledges I I. A spring, K, inclosed in the case L, which screws on the tube D, constantly presses the rod J down and is regulated by a screw, M,Which passes through the end of the case L and is held by the binding-nut N.

The operation is as follows: Assuming the piston to be midway of the cylinder on the forward stroke, as shown in Figs. 2 and 3, the ports 6 f then register with the tubes E F, respectively, and the rod J .rests on the ledge I. At the end of the stroke the rod J passes over the end of the ledge I onto the inclined plane o', against which by force of the spring K it presses and forces it back until it reaches the lower end of the ledge 1, thereby causing a partial revolution of the piston and bringing the ports e f opposite the tubes E F for the return-stroke. It is obvious, however, that other devices may be employed to cause the partial rotation of the piston. Hence, I do not confine my invention to the exact devices hereinbefore shown for that purpose; but

\Vhat I claim, and desire to secure by Letters Patent, is-- 1. The combination, with the cylinder A,

, having the inlet E and outlet F and tube D, of

the piston G, provided With the ports 6 cf f, channel ll, ledges I I, and inclined planes '11 t", together with the rod D and spring K, all 0011- structcd and arranged substantially as shown, and for the purpose specified.

2. The combination, with a piston having inlet and outlet ports arranged by a partial 

